FAQ01574 of Measuring / Motor Protective Relays FAQ

Can you connect the K2CU Heater Element Burnout Detector's control power supply from a circuit other than the heater circuit?

Answer

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The control power supply for the K2CU is generally the same as the heater circuit power supply.

Explanation:

The K2CU Series consists of two types of Heater Element Burnout Detector: one without gate input terminals and one with gate input terminals, as described below.

1. Detectors with Gate Input Terminals (K2CU-F[][]A-[], K2CU-P)

Synchronization must e made with Solid State Relays and magnet contactors for heater control.The same power supply must be therefore be used.

The following table lists the models without gate input terminals.Large-capacity Detectors with Built-in CTs (K2CU-F)

Control powersupply voltage

Operating current

4 to 10 A AC

8 to 20 A AC

16 to 40 A AC

32 to 80 A AC

100 VAC

Voltage fluctuationcorrection provided

K2CU-F10A-C

K2CU-F20A-C

K2CU-F40A-C

K2CU-F80A-C

110 VAC

K2CU-F10A-D

K2CU-F20A-D

K2CU-F40A-D

K2CU-F80A-D

200 VAC

K2CU-F10A-E

K2CU-F20A-E

K2CU-F40A-E

K2CU-F80A-E

220 VAC

K2CU-F10A-F

K2CU-F20A-F

K2CU-F40A-F

K2CU-F80A-F

Small-capacity Plug-in Detectors (K2CU-P)

Control powersupply voltage

Operating current

0.25 to 0.5 A AC

0.5 to 1 A AC

1 to 2 A AC

2 to 4 A AC

100/200 VAC

Voltage fluctuation correctionprovided

K2CU-F0.5A-A

K2CU-P1A-A

K2CU-P2A-A

K2CU-P4A-A

No voltage fluctuation correction

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K2CU-P1-A

K2CU-P2-A

K2CU-P4-A

110/220 VAC

Voltage fluctuation correctionprovided

K2CU-F0.5A-B

K2CU-P1A-B

K2CU-P2A-B

K2CU-P4A-B

No voltage fluctuation correction

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K2CU-P1-B

K2CU-P2-B

K2CU-P4-B

2. Detectors with Gate Input Terminals (K2CU-F[][]A-[]GS)

All models with gate input terminals are equipped with a voltage fluctuation correction function. Because this function corrects the standard value of the internal setting circuits, if it does not use the same power supply, errors will occur in the operating values due to fluctuations in the control power supply voltage. This is why the same power supply must be used.

The following table lists the models with gate input terminals.Models with gate input terminals (K2CU-F[][]A-[]GS)

Control powersupply voltage

Operating current

4 to 10 A AC

8 to 20 A AC

16 to 40 A AC

32 to 80 A AC

100 VAC

Voltage fluctuationcorrection provided

K2CU-F10A-CGS

K2CU-F20A-CGS

K2CU-F40A-CGS

K2CU-F80A-CGS

110 VAC

K2CU-F10A-DGS

K2CU-F20A-DGS

K2CU-F40A-DGS

K2CU-F80A-DGS

200 VAC

K2CU-F10A-EGS

K2CU-F20A-EGS

K2CU-F40A-EGS

K2CU-F80A-EGS

220 VAC

K2CU-F10A-FGS

K2CU-F20A-FGS

K2CU-F40A-FGS

K2CU-F80A-FGS

Note:When combining a PID-control Temperature Controller with a heater's temperature control system, a Detector with gate input terminals must be used. In this case, also use a Temperature Controller with a voltage output.